单项选择题

Which of the following is equal to
of 0.1 percent

(A) 0.000025
(B) 0.00025
(C) 0.0025
(D) 0.025
(E) 0.25

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单项选择题

For senior class pictures, a photographer charges x dollars to make a negative, dollars for each of the first 20 prints, and dollars for each print in excess of 20 prints. If $80 is the total charge to make a negative and 30 prints, what is the value of x

(A) 3
(B) 4
(C) 5
(D) 6
(E) 7

单项选择题

The percent decrease in average number of production hours per widget from 1990 to 2000 was approximately

A．44%
B．36%
C．34%
D．32%
E． 27%

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